Question

我有三个表（TABLE_A，TABLE_B，TABLE_C），我在C_MAIN_REF上加入它们。 TABLE_B有多个条目，我只需要返回一个，无关紧要？

任何想法？

编辑：

SELECT C.C_UNIT_CODE as BU,'EPLC' as PRODUCT, A.BENE_NM as CUSTOMER, A.C_MAIN_REF,
        A.C_TRX_REF, A.PRES_CCY, TO_CHAR(A.PRES_AMT) AS PRES_AMT, A.PRES_DT AS PRES_DATE,
        A.DOC_STAT, '' AS APPL_RESPONSE, A.SETTLE_STATUS as SETTLE_STATUS 
    FROM EPLC_EM_NEGO A
    INNER JOIN CPYT_SCHEDULE B
           ON a.C_MAIN_REF = b.C_MAIN_REF AND ROWNUM =1
    INNER JOIN EPLC_MASTER C
            ON a.C_MAIN_REF = c.C_MAIN_REF
    WHERE a.CLS_DRWG_FLG = 'NO' AND b.CPYT_UNPAID_FLAG = 'T'

上面是我正在使用的当前查询，但问题是CPYT_SCHEDULE中有多个条目我不想这样，所以连接只包含CPYT_SCHEDULE表中的一行;

目前正在返回

BU   PRODUCT CUSTOMER               C_MAIN_REF   C_TRX_REF        PRES_CCY PRES_AMT  PRES_DATE DOC_STAT     SETTLE_STATUS
------------ ---------------------------------------------------- -------- --------- --------- ------------ -------------
GB01 EPLC    Finance Customer No. 5 XL000053GB01 XL000053GB01-01  USD      90000     24-AUG-12 COMPLIANT    Settle      
GB01 EPLC    Finance Customer No. 5 XL000053GB01 XL000053GB01-01  USD      90000     24-AUG-12 COMPLIANT    Settle       
GB01 EPLC    Finance Customer No. 5 XL000053GB01 XL000053GB01-01  USD      90000     24-AUG-12 COMPLIANT    Settle       
GB01 EPLC    Finance Customer No. 5 XL000053GB01 XL000053GB01-01  USD      90000     24-AUG-12 COMPLIANT    Settle

但所需的输出是

BU   PRODUCT CUSTOMER               C_MAIN_REF   C_TRX_REF        PRES_CCY PRES_AMT  PRES_DATE DOC_STAT     SETTLE_STATUS
------------ ---------------------------------------------------- -------- --------- --------- ------------ -------------
GB01 EPLC    Finance Customer No. 5 XL000053GB01 XL000053GB01-01  USD      90000     24-AUG-12 COMPLIANT    Settle

Answer 1

类似的东西：

SELECT C.C_UNIT_CODE as BU,
       'EPLC' as PRODUCT, 
       A.BENE_NM as CUSTOMER, 
       A.C_MAIN_REF,
       A.C_TRX_REF, 
       A.PRES_CCY, 
       TO_CHAR(A.PRES_AMT) AS PRES_AMT, 
       A.PRES_DT AS PRES_DATE,
       A.DOC_STAT, 
       '' AS APPL_RESPONSE, 
       A.SETTLE_STATUS as SETTLE_STATUS 
FROM EPLC_EM_NEGO A
INNER JOIN (select cs.*, 
                   row_number() over (partition by C_MAIN_REF) as rn
            from CPYT_SCHEDULE cs) b 
       ON a.C_MAIN_REF = b.C_MAIN_REF AND b.rn = 1
INNER JOIN EPLC_MASTER C
        ON a.C_MAIN_REF = c.C_MAIN_REF
WHERE a.CLS_DRWG_FLG = 'NO' 
  AND b.CPYT_UNPAID_FLAG = 'T'

Answer 2

以下子选项对我有用，感谢所有答案和输入。

SELECT C.C_UNIT_CODE as BU,'EPLC' as PRODUCT, A.BENE_NM as CUSTOMER, A.C_MAIN_REF, A.C_TRX_REF, A.PRES_CCY, TO_CHAR(A.PRES_AMT) AS PRES_AMT, A.PRES_DT AS PRES_DATE, A.DOC_STAT, '' AS APPL_RESPONSE, A.SETTLE_STATUS as SETTLE_STATUS
FROM E_EM_NEGO A, EPLC_MASTER C
WHERE a.CLS_DRWG_FLG = 'NO' AND a.C_MAIN_REF = c.C_MAIN_REF
     AND a.C_MAIN_REF = (
     SELECT C_MAIN_REF FROM CPYT_SCHEDULE B
     WHERE B.CPYT_UNPAID_FLAG = 'T' AND b.C_MAIN_REF = a.C_MAIN_REF AND rownum=1)

从Oracle的内连接右表返回一行

2 个答案: